In Exercises 13, use a graphing utility to graph the function and approximate the limit (if it exists). Then nd the limit (if it exists) algebraically by using appropriate techniques. :8 1 x2 + 5x 3 2 1- 15 21 2-111}? 3-112 xs In Exercises 4 and 5, use a graphing utility to graph the function and approximate the limit. Write an approximation that is accurate to four decimal places. Then create a table to verify your limit numerically. sin 3x 82: - l 4. lim 5. lim 1\") x 5) x